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Q:
scala collection can't be implicitly converted to scala.collection.immutable.Stream
I'm just getting started with Scala and I'm trying to write a simple routine that collects all the elements of a collection.
object Counter {
def collect[T](collection: scala.collection.Iterable[T]): List[T] = {
collection.foreach { v =>
println(v)
}
}
def main(args: Array[String]): Unit = {
val v = new Vector[Int]
v.append(1)
v.append(2)
collect(v)
}
}
It compiles fine, but when I run it I get the following error:
scala: non-variable type argument Int in type scala.collection.immutable.Stream[Int] cannot be converted to parameterized type scala.collection.immutable.Stream[T]
Why? It's a bit confusing to me why the compiler won't let me add an element to v here, but the fact that I'm collecting a collection implies that it is capable of handling collections of some sort, right?
A:
The Vector[Int] is just a shorthand for the Set[Int] which is why the compiler is rejecting the attempt to add a value to it. You can change your function to:
object Counter {
def collect[T](collection: scala.collection.Iterable[T]): List[T] = {
collection.foreach { v =>
println(v)
}
}
def main(args: Array[String]): Unit = {
val v = new scala.collection.mutable.Set[Int]
v.add(1)
v.add(2)
collect(v)
}
}
A:
This works fine:
val v = Vector(1,2,3)
If you put it into a mutable container it ac619d1d87
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